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【单选题】
去年，广州市出台了《对城市绿化工程施工的验收规范》，其中对漂浮类水生植物凤眼莲和浮萍的种植适宜水深不设限制，这意味着来自南美洲的外来物种——凤眼莲可全方位用于该城市的水体绿化工程。根据以上信息，现有三个命题： Ⅰ．未来几年，该市水体绿化工程将大量种植凤眼莲和浮萍 Ⅱ．未来几年，该市与南美洲的凤眼莲贸易将急剧增加 Ⅲ．该市对种植凤眼莲和浮萍的水域深度没作具体要求 以下选项中，哪项一定为真( )A.
Ⅰ、Ⅱ和Ⅲ
B.
只有Ⅱ和Ⅲ
C.
只有I和Ⅱ
D.
只有Ⅲ
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